Loupe is an editor with a memory: it learns how you write, helps you understand what you're writing, and flags what doesn't sound like you. Every sentence is embedded with Voyage AI and checkpointed to MongoDB Atlas, so the same text literally reads differently once the database knows you. Your essay's pacing recalibrates to your own $percentile stats, a decay-weighted voice centroid unlocks per-paragraph "sounds like you" verdicts, and each scene is measured against the 3,400 movie plots MongoDB ships pre-embedded in sample_mflix ("this paragraph is running like a crime story"). When a pasted AI sentence stops sounding like you, Loupe catches it with receipts — your own nearest sentence, surfaced by $vectorSearch — and one click rewrites it in your voice, graded by the same meter that caught it; attempts below your median get sent back with their own score. It also reads your draft aloud in your own ElevenLabs-cloned voice, and every rewrite traces to LangSmith. No cold start, no vibes.
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